Any Free or Open Source Software (FOSS) for fluid flow simulation in porous media?

The simulators I know are either not maintained, at a very early stage of development, or written in old programming languages, namely:

* BOAST, UTCHEM, etc. written in Fortran 77 --
* DuMuX written on top of a C++ library --

If you know any alternative, please share.


* MRST is a MATLAB® toolbox that is also part of the OPM initiative --

* OPM is the best choice if you're a C++ programmer working in the field. Please invest time using it and contribute with code whenever possible --